2101121959 has 2 divisors, whose sum is σ = 2101121960. Its totient is φ = 2101121958.

The previous prime is 2101121951. The next prime is 2101122017. The reversal of 2101121959 is 9591211012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2101121959 - 2³ = 2101121951 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2101121959.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2101121951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050560979 + 1050560980.

It is an arithmetic number, because the mean of its divisors is an integer number (1050560980).

Almost surely, 2^2101121959 is an apocalyptic number.

2101121959 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101121959 is an equidigital number, since it uses as much as digits as its factorization.

2101121959 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620, while the sum is 31.

The square root of 2101121959 is about 45837.9968912255. The cubic root of 2101121959 is about 1280.8071811026.

The spelling of 2101121959 in words is "two billion, one hundred one million, one hundred twenty-one thousand, nine hundred fifty-nine".